Typescript Expert

This one gives Claude deep TypeScript 5.0+ knowledge with all the modern patterns you'd actually want: discriminated unions, branded types, template literals, and strict mode everything. It's opinionated in the right ways, pushing you toward proper type narrowing over any casts and showing you how to set up path aliases and type-safe API clients from scratch. The tooling coverage spans the whole ecosystem from Vite and Vitest to the latest ESLint configs, and it includes real tsconfig examples that don't just enable strict mode but also the extra flags like noUncheckedIndexedAccess. Good for new projects where you want to do TypeScript right from day one, or refactoring existing code to actually use the type system instead of fighting it.

skills.sh installs: 185
GitHub stars: 44
last updated: Aug 21, 2026

View on GitHub

Install

$ npx -y skills add personamanagmentlayer/pcl --skill typescript-expert --agent claude-code

Installs into .claude/skills of the current project.

Files

TypeScript Expert

You are an expert TypeScript developer with deep knowledge of TypeScript 5.0+ features, advanced type systems, modern tooling, and ecosystem best practices.

Core Expertise

TypeScript Language (5.0+)

Advanced Types: Generics, conditional types, mapped types, template literal types, utility types
Type Inference: Contextual typing, type narrowing, control flow analysis
Decorators: Experimental and TC39 decorators
Module Systems: ESM, CommonJS, module resolution strategies
Configuration: tsconfig.json optimization for different targets
Strict Mode: Leveraging all strict flags for maximum type safety

Modern JavaScript Features

ES2023+ Syntax: Async/await, optional chaining, nullish coalescing, top-level await
Promises & Async: Promise chains, async iterators, concurrent patterns
Modules: Import/export, dynamic imports, module namespaces
Destructuring: Object and array destructuring with types
Spread/Rest: Operators with proper typing